Acoustics – Sound-modifying means – Muffler – fluid conducting type
Patent
1994-09-02
1996-02-20
Dang, Khanh
Acoustics
Sound-modifying means
Muffler, fluid conducting type
181227, 181250, F01N 702
Patent
active
054930804
ABSTRACT:
A device for sound suppression in a channel system for flowing gases or air, particularly an exhaust system or intake system in an internal combustion engine, includes at least one channel which is in communication with two volumes or apertures, wherein standing sound waves arise in the channel. One of the two volumes or apertures can be in the form of a main silencer or a filter housing while the other volume of aperture is in the form of a smaller silencer or an inlet pipe. The pipe, which may be in the form of a volume space, has one end, an inlet opening, in acoustical communication with the channel, while an opposite end is wholly or partly closed against the environment. The pipe is located outside the channel and an acoustic permeable filter is provided in the region near the inlet opening of the pipe. The filter has a flow resistance within the interval 5 Ns/m.sup.3 -2000 Ns/m.sup.3, preferably within the interval 30-300 Ns/m.sup.3.
REFERENCES:
patent: 2297046 (1942-09-01), Bourne
patent: 3396812 (1968-08-01), Wilcox et al.
patent: 3612217 (1971-10-01), Heath
patent: 3776364 (1973-12-01), Van Doeren
patent: 5245140 (1993-09-01), Wu
AB Volvo
Dang Khanh
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